Abstract
Reproductive activity in cowpea [ Vigna unguiculata (L.) Walp.] is characterized by two separate flushes of pod production. Grain yield from the second flush strongly depends on extent of plant death due to soil pathogens after the first flush is completed. A delayed‐leaf‐senescence (DLS) trait enhances the extent of plant survival but may reduce first‐flush grain yield. Heat tolerance during reproductive development can increase first‐flush grain yield and has been incorporated into cowpea but may reduce plant survival after the first flush is completed. Interactive effects when combining DLS and heat‐tolerance traits were evaluated. A cross was made between a DLS heat‐susceptible line and a non‐DLS heat‐tolerant line. Evaluation and selection for these traits were carried out over several generations and a set of 40 lines with 10 each of the four combinations of DLS +/− heat tolerance and non‐DLS +/− heat tolerance was developed. These lines were evaluated in contrasting field environments. Under senescence‐inducing conditions, the DLS trait greatly increased plant survival and individual seed size, and it only caused a small reduction in first‐flush grain yield that would have been off‐set several fold by an enhanced second‐flush grain yield. The heat‐tolerance trait increased first‐flush grain yield in very hot environments and only slightly enhanced the tendency for premature plant death in non‐DLS lines with no effect on lines having the DLS trait. The DLS and heat‐tolerance traits can be effectively incorporated into cowpea and would have beneficial effects on grain yield in specific circumstances with only small detrimental interactive effects.
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Claims 8
Claim · model-written summary
The DLS trait greatly increased plant survival and individual seed size.
- Taxon
- Cowpea
Vigna unguiculatat0 - Treatment
- DLS traite2
- Outcome
- plant survival and individual seed sizee2
- Direction
- greatly increasede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Independently Expressed in Cowpea”
e2“the DLS trait greatly increased plant survival and individual seed size”
Claim · model-written summary
The DLS trait caused only a small reduction in first-flush grain yield.
- Taxon
- CowpeaVigna unguiculatat0
- Treatment
- DLSe1
- Outcome
- first‐flush grain yielde3
- Direction
- small reductione3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Independently Expressed in Cowpea”
e1“A delayed‐leaf‐senescence (DLS) trait enhances the extent of plant survival but may reduce first‐flush grain yield”
e3“it only caused a small reduction in first‐flush grain yield”
Claim · model-written summary
The small first-flush yield loss from the DLS trait would be offset several fold by an enhanced second-flush grain yield.
- Taxon
- CowpeaVigna unguiculatat0
- Treatment
- DLSe1
- Outcome
- second‐flush grain yielde3
- Direction
- enhancede3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Independently Expressed in Cowpea”
e1“A delayed‐leaf‐senescence (DLS) trait enhances the extent of plant survival but may reduce first‐flush grain yield”
e3“by an enhanced second‐flush grain yield”
Claim · model-written summary
The heat-tolerance trait increased first-flush grain yield in very hot environments.
- Taxon
- CowpeaVigna unguiculatat0
- Treatment
- heat‐tolerance traite4
- Outcome
- first‐flush grain yielde4
- Direction
- increasede4
- Setting
- very hot environmentse4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Independently Expressed in Cowpea”
e4“The heat‐tolerance trait increased first‐flush grain yield in very hot environments”
Claim · model-written summary
The heat-tolerance trait only slightly enhanced premature plant death in non-DLS lines.
- Taxon
- CowpeaVigna unguiculatat0
- Material
- non‐DLS linese5
- Treatment
- heat‐tolerance traite4
- Outcome
- tendency for premature plant deathe5
- Direction
- slightly enhancede5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Independently Expressed in Cowpea”
e4“The heat‐tolerance trait increased first‐flush grain yield in very hot environments”
e5“only slightly enhanced the tendency for premature plant death in non‐DLS lines”
Claim · model-written summary
The heat-tolerance trait had no effect on premature plant death in lines with the DLS trait.
- Taxon
- CowpeaVigna unguiculatat0
- Material
- lines having the DLS traite6
- Treatment
- heat‐tolerance traite4
- Outcome
- premature plant deathe5
- Direction
- no effecte6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Independently Expressed in Cowpea”
e4“The heat‐tolerance trait increased first‐flush grain yield in very hot environments”
e5“only slightly enhanced the tendency for premature plant death in non‐DLS lines”
e6“with no effect on lines having the DLS trait”
Claim · model-written summary
The DLS and heat-tolerance traits can be incorporated into cowpea and would have beneficial effects on grain yield in specific circumstances.
- Taxon
- cowpeaVigna unguiculatae7
- Treatment
- DLS and heat‐tolerance traitse7
- Outcome
- grain yielde7
- Direction
- beneficiale7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Independently Expressed in Cowpea”
e7“The DLS and heat‐tolerance traits can be effectively incorporated into cowpea and would have beneficial effects on grain yield in specific circumstances”
Claim · model-written summary
Combining the DLS and heat-tolerance traits had only small detrimental interactive effects.
- Taxon
- CowpeaVigna unguiculatat0
- Treatment
- DLS and heat‐tolerance traitse7
- Outcome
- interactive effectse2
- Direction
- small detrimentale2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Independently Expressed in Cowpea”
e7“The DLS and heat‐tolerance traits can be effectively incorporated into cowpea and would have beneficial effects on grain yield in specific circumstances”
e2“with only small detrimental interactive effects”
The same questions in other papers
heat · yield · Vigna unguiculata (cowpea)Positive and negative results
2 papers in the same direction as this paper · 5 in the opposite direction
- negative
- no effect
- negative
4 papers more in this group
See all 8 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.